HMNR28D Overview
The HMNR28D(V) TIMEKEEPER SRAM is a 2Kb x 8 non-volatile static RAM and real time clock organized as 2,048 words by 8 bits. The special DIP package provides a fully integrated battery back-up memory and real time clock solution. The HMNR28D(V) directly replaces industry standard 2Kbit x 8 SRAMs.
HMNR28D Key Features
- INTEGRATED LOW POWER SRAM, REAL TIME CLOCK, POWER-FAIL CONTROL CIRCUIT, BATTERY and CRYSTAL
- BCD CODED YEAR, MONTH, DAY, DATE, HOURS, MINUTES, and SECONDS
- AUTOMATIC POWER-FAIL CHIP DESELECT and WRITE PROTECTION VOLTAGES : (VPFD = Power-fail Deselect Voltage)
- HMNR28D : VCC = 4.5 to 5.5V 4.2V ≤ VPFD ≤ 4.5V
- HMNR28DV: VCC = 3.0 to 3.6V 2.7V ≤ VPFD ≤ 3.0V
- CONVENTIONAL SRAM OPERATION : UNLIMITED WRITE CYCLES
- SOFTWARE CONTROLLED CLOCK CALIBRATION FOR HIGH ACCURACY
HMNR28D Applications
- 10 YEARS OF DATA RETENTION and CLOCK OPERATION IN THE ABSENCE OF POWER PIN and FUNCTION PATIBLE WITH INDUSTRY STANDARD 2K x 8 SRAMS